Experimental investigation of the influence of an orifice plate on the pressure pulsation amplitude in the pulsating flow in a straight pipe

To repair leaking pipelines for oil, natural gas and other dangerous media, a kind of pipeline sealing robot is proposed. The device is mainly divided into a robot drive unit, connection unit, and blocking unit. The robot drive unit is used to pull the blocking unit, allowing it to move in the pipeline. The connection unit is used to connect the robot drive unit and the blocking unit. The blocking unit is used to complete the repair at the leakage point. When the robot operates, the drive unit drags the blocking device to the pipeline leakage location, and the front camera can detect the size and shape of the leakage hole. The sealing unit is located at the leakage point, an airbag is inflated, and the adhesive in it is used to seal and repair the leak. Two performance indices (climbing performance and curve passing performance) are evaluated when the robot drive unit is walking. A 3D model of the robot is established, and the performance index of the robot is simulated and analyzed using virtual prototype technology. An experimental platform is built for verification. The conclusions are as follows: (1) A spring with a 13 N/mm rigidity yielded the best performance, and the robot could crawl up a 37° slope. (2) When the deflection angle of the driving wheel was set to 30°, the robot could smoothly pass a bend with a radius of curvature of 500 mm. Thus, the robot performance met the design requirements.

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“…Straight pipes are the main components of pipelines, and they are also the most basic type of oil and gas pipeline [33].…”

Section: Straight Pipelinementioning

confidence: 99%

Research on Passing Ability and Climbing Performance of Pipeline Plugging Robots in Curved Pipelines

Yan

Wang

et al. 2020

IEEE Access

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“…U početnim istraživanjima su se eksperimentalno ispitivali standardni oblici mernih blendi i poredili sa postavljenim matematičkim modelima u cilju optimizacije potrošnje energije i tačnosti merenja protoka, a jedan pravac istraživanja se kretao ka predlaganju novih oblika mernih blendi. Novi oblici mernih blendi su ispitivani u laboratorijskim uslovima [3][4][5][6][7]. Rezultati tih ispitivanja su poređeni sa rezultatima prethodnih istraživanja ili su postavljani matematički modeli, koji su zatim poređeni sa eksperimentalnim rezultatima [8][9][10][11][12][13][14].…”

Section: Slika 1 Profil Apsolutnog Statičkog Pritiska Fluida Na Zid unclassified

“…Razlike pritisaka su merene pomoću diferencijalnih "U" manometara (7). Kao radna tečnost je korišćen CHCl3 (trihlormetan, POSH SA, Poljska), obojen crvenom organskom bojom Sudan III ((1-(4-(fenilazo)fenilazo)-2-naftol), Carlo Erba, Italija), radi lakšeg očitavanja.…”

Section: Slika 6 šEmatski Prikaz Laboratorijske Aparature Za Ispitivunclassified

Analysis of new forms of orifice plates using computational fluid dynamics

Halas

Bera

Omorjan

et al. 2019

Hem Ind

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Izvod U mnogim granama tehnike javljaju se problemi merenja protoka fluida. Merne blende, zbog svojih mnogih prednosti predstavljaju najzastupljeniji instrument za merenje protoka fluida kroz cevovode. Sa druge strane njihova upotreba povećava troškove rada industrijskih postrojenja i cevovoda. U ovom radu dizajnirana su i ispitana tri nova oblika mernih blendi. Njihov cilj je bio ušteda energije, a samim tim i smanjenje troškova rada. Novi oblici mernih blendi, kao i jedna standardnog oblika koja je poslužila kao referentna, dizajnirani su u programskom paketu SolidWorks. Ušteda energije je postignuta dizajnom koji smanjuje otpor merne blende kao elementa cevovoda. Zatim su, prema predloženom algoritmu, dizajnirani oblici ispitani pomoću simulacije računarske dinamike fluida (RDF) u programskom paketu COMSOL Multiphysics i primenom tehnologije 3D štampanja, FDM postupkom (eng. Fused Deposition Modeling), izrađeni i ispitani u laboratorijskim uslovima. Rezultati laboratorijskih ispitivanja su prikazani uporedo sa rezultatima RDF simulacije. Dobijeni rezultati pokazuju znatan efekat uštede energije. Utvrđeno je da se pomoću RDF simulacije mogu dobiti podaci na osnovu kojih se može doneti odluka da li novi oblik merne blende treba korigovati ili ima smisla pristupiti laboratorijskom ispitivanju.

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“…The noise induced by the oil trap phenomenon and the pressure shock noise caused by the flow pulsation are the main noise sources of gear pumps [29][30][31][32]. Therefore, research on the mechanism of gear pump vibration and noise reduction is not only a key topic in the field, but also the interest of internationally renowned manufacturers that heavily invest in research.…”

Section: Introductionmentioning

confidence: 99%

Research on Flow Characteristics of Straight Line Conjugate Internal Meshing Gear Pump

Chai

Yang

et al. 2020

Processes

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The improvement of the overall performance of hydraulic pumps is the basis of intelligent hydraulics. Taking the straight line conjugate internal meshing gear pump as the research object, the theoretical flow rate and the geometric flow pulsation rate equations are established in this study through the volume change method. The change laws of the gear pair’s geometric parameters on the theoretical flow rate and the geometric flow pulsation rate are studied. The simulation model of the internal flow channel is established, and the influence factors and the influence degree of the flow pulsation and average flow rate are analyzed. The high-pressure positive displacement pump test system is also designed and built. The performance evaluations are conducted, and the experimental results are analyzed. The results show that the periodic change of the meshing point position is the root cause of the geometric flow pulsation. The theoretical flow rate and the geometric flow pulsation rate are 103.71 L/min and 1.76%, respectively. To increase the theoretical flow rate whilst decreasing the geometric flow pulsation rate, the tip circle radius of the external gear should be increased as much as possible within the allowable range of the design calculation. Amongst the three influencing factors that produce flow pulsation, the oil compressibility has no effect on the flow pulsation. The uneven internal leakage is the main factor, and the geometric flow pulsation only accounts for a small proportion. The internal leakage reduces the simulated flow rate by 3.59 L/min. The difference between the experimental and simulated flow rates is less than 2%. Within the allowable speed range, the rotation speed of the external gear should be increased as much as possible to increase the average flow rate and the volumetric efficiency.

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Experimental investigation of the influence of an orifice plate on the pressure pulsation amplitude in the pulsating flow in a straight pipe

Cited by 22 publications

References 12 publications

Research on Passing Ability and Climbing Performance of Pipeline Plugging Robots in Curved Pipelines

Research on Passing Ability and Climbing Performance of Pipeline Plugging Robots in Curved Pipelines

Analysis of new forms of orifice plates using computational fluid dynamics

Research on Flow Characteristics of Straight Line Conjugate Internal Meshing Gear Pump

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